Method of making hexagonal nuts.



citizen of the United States, residing UNITED STATES PATENT. OFFICE.

GEORGE DUNHAM, OF UNIQNVILLE, CONNECTICUT.

To all whom it may concern:

Be it known that I, GEORGE DUNHAM, a at Unionville, in. the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in the Method of Making Hexagonal lowing is a specification.

My invention relates to the method of making hexagonal nuts from a'flat bar of metal by means of dies and punches; and the object of my improvement is economy of production by facilitating the manufacture and at the same time to produce a smooth nut.

In the accompan 'ng drawings," Figure 1 is a plan view of a' ar of metal, illustrating the first step in my method of making nuts therefrom. Fig. 2 is a plan view of& nut as severed from the end of'the' bar shown in Fig. 1. Fig. 3 isa plan view of a bar of metal,

illustrating the first step in my method of making nuts with, the sides of the nuts differently related .to thebar of metal. Fig. 4 is a plan view of a nut as severed from the end-of the'bar,'Fig. 3.

My method is particularly applicable to V making nuts from-a bar of metal. by means of a gang of dies and punches which form the round hole, blank out the nut, and then trim .the sides thereof, and by m improvement all the necessary feed to pro ucea trimmed nut ma be produced by a simple feed of the bar an without any carrier or transferring device, whereby an automatic. machine is very. muchsimplified and a superior nut or nut-blank is'produced eoonomicall A designates a fiat bar of meta which is about the same width as the intended nutblank, measured centrall from side to side T e ordinary round holes 5 are punched centrally with reference to each intended nut-blank. At the end\of the bar the'faoes 6 6 represent one side of substantially a V-shaped notch, a complete one of the said notches 7 beingformed on opposite side edges of the bar, as fshownat the left of the partly-formed nut-blank 8 at a the end of thebar. Each of these notches 7 corner of the trimmin -die in trimming andis in the form of'an acute-angled V, with a truncated bottomor apex 9; y The small notch 10 in the end of the bar was formed by one severing a nut or nut-b ank from the bar. I

Specification of Letters. Patent. Application filed May '7, 1906. Serial No. 315,569-

Nuts, of which the fol- METHOD OF MAKING HE XAGONAL NUTS- Patented Oct. 30, 1906.

" hand end placed in position over the roundhole die for punching the hole for the first nut-blank on the end of the bar. The bar is then fed along the Width of one nut for .punching the second round hole, and at the same time the two corners of the bar. will be cut ofi by the notching-dies and punches, leaving the faces 6 6. The bar is then moved along the proper distance for another nut-- blank, and the third round hole 5 and .the pair of notches 7 will be out, and at the same time the notch 10 will be'formed. in the end of the bar by the'trimmingdie and punch, if any metal comes within their range. The

bar'at this stage is represented in Fig. 1 with the bar along. At the next blow of the press another round hole and pair of notches will be formed, as indicated by broken lines in Fig. 1, and at the same time the blank 8 will be trimmed by the trimming-die and punch and also severed'from the bar, as'shown in F ig. .2. i

Heretofore it has been the practice in making'hexagonal nuts to sever the nut-blanks 9 fromthe bar before they are trimmed, and

thus it will be seen that they cannot be fed to the trimming die by. merely feeding the bar along.

The method illustrated in Figs. 3 and 4 is the same, only the "nuts are differently related to the bar'A which is wider than the bar A, so as to correspond with the dimensions ofa nut-blank measured from corner to corner instead of' from side to side; The notches 7 are not truncated atthe apex and the faces 6 6 are formed on the partlyformed nut-blank'8 by the first sides of the notchi'ng-die's and punches. The broken lines indicate the same in Fig. 3 as in Fig. 1,

and the'descrip tion of the operation in con- V nection with well to Figs. 3 and 4, In both cases the first gs. 1 and 2 applies equally.

step in the method is to produce a partiallyformed nut-blank on the end of the bar by cutting the opposite edges of the bar on oblique lines corresponding to the confronting edges of two adjoining nut-blanks with out severing a'nut from the bar, and the second step is trimming the previouslycut edges of the partly-formed nut-blank and at the same operation severing the nutblank from the bar.

I am aware that square nuts have hereto fore been made from a bar of metal by first punching the round hole (or a series of holes) greatest diameter of the blank.

in the bar-and then. cutting crude quadrangular nut-blanks therefrom by a die and punch that cut. on all four sides of the blank, so as to severthe blank by a cross-cut at one side of the blank and shave the blank by cutting on thethree other sides, and the same is hereby disclaimed.

Attempts have been made to make hexagonal nuts from a bar of metal by first punching a round hole (or a series ofholes) in the bar and then cutting a blank from the end of the bar by a die and punch that cut on the six sides of the blank; but it was found that in so doing the original round hole was distorted and elongated in the direction of the By cutting the. opposite edges of the bar to conform to the. sides of a hexagonal nut, as in my method, and then cutting a nut-blank from the bar by cutting on all six sides of the blank, so as to merely shave the previouslyout edges, there is no distortion of the round hole, and the blank is smoothly trimmed throughout the major portion of its edges.

Iclaim as my invention- 1. The herein-described method of making hexagonal nuts which consists in'prod ucing a partl -form'ed nut-blank at one end of a flat bar of metal by outtingits opposite edges on oblique lines corresponding to the confronting edges of two adjoining nut-blan ks without thereby severing a nut from the said bar, and then trimming the edges before cut on said oblique lines and at the sameoperation severing the blank from the bar.

2. The herein-described method of making hexagonal nuts which consists in producing a partly-formed nut-blank at one end of a hat bar of metal by cutting notches therein at its opposite edges in the form of an acuteangled'V with a truncated apex, the sides of the said V extending on lines corresponding to the confronting edges of two adjoining nut-blanks, leaving an uncut portion at op )0- site edges of the said bar to form two parallel side edges of a blank between each successive pair of notches, and then severing the partlyformed nut-blank from the bar and at the same operation trimming the side edges thereof.

GE RGE' D'UNHAM. 

